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Akai LCT3201AD black screen in 2-3 sec

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    Akai LCT3201AD black screen in 2-3 sec

    Ok i know its junk but trying to help out a buddy, its a Akai LCT3201AD ,
    Power supply is putting out correct volts on all pins, recaped alot of bad 220uf on the main and tuner board, get geen light and screen for a few sec, power light stays green and volts remain good to inverter. inverter bad? have done the 1 back light at a time thing , no good. ? any ideas?
    can post pic's but no sure theres a need with the info i have.
    Thanks
    Mike

    #2
    Re: Akai LCT3201AD black screen in 2-3 sec

    http://blog.coppelltvrepair.com/2011...not-power.html

    Comment


      #3
      Re: Akai LCT3201AD black screen in 2-3 sec

      Thanks for the link , but been there done that on power supplys. Mine is getting and maintaning correct voltage, but black screen in 2-3 sec after start up. Do you think i missed something?
      mike

      Comment


        #4
        Re: Akai LCT3201AD black screen in 2-3 sec

        2 seconds to black can be

        a) bad ccfls
        b) bad ccfl wiring
        c) bad inverter transformer (secondary windings)
        d) bad caps

        All explained with posts #19 and #20 at

        https://www.badcaps.net/forum/showthread.php?t=10419
        --- begin sig file ---

        If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

        We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

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          #5
          Re: Akai LCT3201AD black screen in 2-3 sec

          Try what retired caps suggests in his post and let us know you findings. If it was me I would make sure that u can see your desktop with a flashlight. This means you can focus on why the CCFL's aren't working.
          Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

          How to resize your pictures guide click HERE
          Retiredcaps Ideal post example click HERE

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            #6
            Re: Akai LCT3201AD black screen in 2-3 sec

            will do and let you know
            Mike

            Comment


              #7
              Re: Akai LCT3201AD black screen in 2-3 sec

              Ok did some checking, have sound and fant video, just no back light , have replaced around 20 220uf caps all bad (tested with my blue ESR meter) a few 470uf and a few 22 uf, . all caps on ps, most 220uf where on the main board and tuner, inverter is getting 24 v , all transformers test same. I am stumped.
              Mike

              Comment


                #8
                Re: Akai LCT3201AD black screen in 2-3 sec

                If you have no backlight versus 2 seconds to black, that is totally different.

                Absolutely no backlight (i.e. no 2 seconds to black) can be

                a) open fuse or fuses
                b) shorted mosfet or transistor on the inverter board
                c) bad inverter pwm chip
                --- begin sig file ---

                If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                Please do not post inline and offsite as they slow down the loading of pages.

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                Comment


                  #9
                  Re: Akai LCT3201AD black screen in 2-3 sec

                  I dont think he means NO back light as in post3 he says it is on for 2 to 3 secs.
                  Please upload pictures using attachment function when ask for help on the repair
                  http://www.badcaps.net/forum/showthread.php?t=39740

                  Comment


                    #10
                    Re: Akai LCT3201AD black screen in 2-3 sec

                    Originally posted by selldoor View Post
                    I dont think he means NO back light as in post3 he says it is on for 2 to 3 secs.
                    But now in post #7, he says no backlight so something might have changed?
                    --- begin sig file ---

                    If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                    We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                    Please do not post inline and offsite as they slow down the loading of pages.

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                      #11
                      Re: Akai LCT3201AD black screen in 2-3 sec

                      No pictures of any boards either.
                      Never stop learning
                      Basic LCD TV and Monitor troubleshooting guides.
                      http://www.badcaps.net/forum/showthr...956#post305956

                      Voltage Regulator (LDO) testing:
                      http://www.badcaps.net/forum/showthr...999#post300999

                      Inverter testing using old CFL:
                      http://www.badcaps.net/forum/showthr...er+testing+cfl

                      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                      http://s807.photobucket.com/user/budm/library/

                      TV Factory reset codes listing:
                      http://www.badcaps.net/forum/showthread.php?t=24809

                      Comment


                        #12
                        Re: Akai LCT3201AD black screen in 2-3 sec

                        Ok guys to clear this up abit, had 2 sec to black, replaced what ended up to be close to 30 caps, then got no back light, and then found a bad transitor on the inverter, now all is good, works like new, by the way most ever cap replaced was 220uf, and few others
                        Thanks all
                        Mike

                        Comment


                          #13
                          Re: Akai LCT3201AD black screen in 2-3 sec

                          which was the transistor you replaced I have the same problem and Replace the capacitors that were bad the volatages correct font need your help please I would greatly appreciate it from ... thanks
                          Last edited by mrwebo; 06-25-2013, 03:34 PM.

                          Comment


                            #14
                            Re: Akai LCT3201AD black screen in 2-3 sec

                            hello sorry the supply voltages are correct Replace capacitors 470uf and 220uf but still turns on and shows the logo of akai and off and the LED remains lit in green I think is the problem of inverter.
                            What is the transistor that was damaged in your case please driving me crazy this tv. sorry for the English but I use google translator ...... thank you very much

                            Comment


                              #15
                              Re: Akai LCT3201AD black screen in 2-3 sec

                              I think it is an inverter transformer and measured with the multimeter the tips of this and gives me strength 180khoms and others give me a measure of 1.5 khoms think that's it.
                              how I can do to turn the trick to remove the transformer protection system or something please help

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